Question: When was Doris Lessing the spouse of Gottfried Lessing?
Paraphrase: When were Gottfried Lessing and Doris Lessing married?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q40874 p:P26 ?s . ?s ps:P26 wd:Q215347 . ?s pq:P580 ?value}